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1553274 
Journal Article 
NOx-TPD as a Tool to Estimate the Accessible Zirconia Surface of ZrO2-Containing Materials 
Law, H; Blanchard, J; Carrier, X; Thomas, C 
2010 
Yes 
Journal of Physical Chemistry C
ISSN: 1932-7447
EISSN: 1932-7455 
114 
21 
9731-9738 
WOS:000278003700028 
NOx adsorption-desorption experiments were carried out on a
series of W-free and W-containing ZrO2 samples. To the best of our knowledge, this study
establishes for the first time NOx-TPD (temperature-programmed desorption of NOx) as a reliable
method to estimate the accessible ZrO2 surface of complex oxides. The NOx uptake by ZrO2 was
found to be 5.8 +/- 0.2 mu mol/m(2). On the tungstated zirconia series of samples, the NOx uptake
decreases linearly with W density up to about 5 W/nm(2), which is in excellent agreement with
literature data for which the pseudo monolayer coverage was obtained by spectroscopic methods.
The accessible ZrO2 surface area of ZrO2/SBA-15 materials, which cannot be ascertained through
common spectroscopic methods, was estimated by WO3 thermal spreading and the NOx-TPD method. Both
values compare very well but NOx-TPD, unlike WO3 thermal spreading, does not alter the integrity
of the investigated sample as the sample is pretreated at lower temperatures (500 instead of 700
degrees C).